Well the car was originally came with an intake that was different. I changed the snorkel to an older version which has a higher noise level but less flow restriction.
I have also done it for my Hyundai Trajet MPV/Minivan. It now gets me about 9-10l/100km urban. Used to give me 12-15.
Here's the pics for the one on the Trajet
I've got a video on Youtube but nevermind the local language.
http://youtu.be/jIbLjQqEvks I have calculated there is a 20% error on the installed FC readout which came from the Continental/Siemens ECU. Can't do anymore test as the car is sitting waiting for some cash to come in so I could do a bit more aero mod work.